James metcalee



QBFIQE,

JAMES METCALFE, RICHARD DAVID METCALFE, AND JAMES CROXON IIIETGALFE, OF ROMILEY, ENGLAND.

INJECTOR.

Specification of Letters Patent.

Patented Aug. 8, 1916.

Applicationfiled October 29, 1915. 7 Serial No. 58,682.

To all whom it may. concern:

Be it known that we, JAMns METCALFE, RICHARD DAVID METGALFE, and JAMES CRoXoN METOALFE, subjects of the King of Great Britain and Ireland, and residents of Injector Works, Romiley, in the county of Chester, England, have invented certain new and useful Improvements in Injectors, of which the following is a specification.

This invention relates to steam injectors, and has for its object to provide improved means for regulating and controlling the overflow from the overflow chamber or chambers of the injector.

The injector described and illustrated is similar in its general construction to that described in our prior Patent No. 905,206, 7

Our invention comprises the improved arrangement or construction of the overflow valves and their cooperating parts as hereinafter described and claimed.

Referring to the accompanying explanatory drawings :-Figure 1 is a sectional elevation of a steam injector constructed in one convenient form in accordance with our invention. Figs. 2, 3 and 4 are respectively front elevation, end elevation and plan of the overflow valve locking lever to be hereinafter referred to.

The same reference letters in the different views indicate the same or similar parts.

Steam enters the injector through the lifting and forcing nozzles a and b, the water entering the water cone 0 from the compartment (Z under the inducing action of the steam jets. The compartment (5 receives its water supply from the feed water tank by way of a pipe (not shown). The overflow chamber around the combining nozzle 6 is divided into two compartments f, g, each fitted with an overflow valve h, z. The overflow valve 2' is loaded by the pressure in the delivery chamber 7' acting through the plunger k and lever m pivoted at a. To prevent any load being placed upon the valve 91 until the pressure in the delivery chamber j exceeds a predetermined amount, we provide a coil spring 0 against which the lever m abuts, so that the pressure of said spring must be overcome before the valve is loaded.

The connection between the lever m and the plunger is is provided by a swing link 39 which allows for the free relative movement of the end of the lever m and the plunger 70 due to the varying angular position of said lever.

To provide in a simple manner for the effective locking in their closed positions of the two overflow valves 7t and i by one looking means so that the steam entering the injector may be utilized for feed water heating purposes by traveling down the feed water pipe to the feed water tank or other vessel, an extension piece 9 is pivoted upon the lever m at 1". Said piece bears upon the stem of the valve 7. By rotating the screwed spindle s so that it engages the extension piece g, both the valves it and 2' are held firmly on their seats.

For normal working, the spindle a is withdrawn clear of the extension piece 9, when the valve 7: can open and close freely according to the difference in the pressures at its two sides, and the valve 2' can likewise open freely until the delivery pressure acting through the lever m overcomes the pressure of the spring 0. But when it is desired to utilize the entering steam for heating the water in the feed tank, the spindle s is brought firmly against the extension piece so looking both valves 7b and i in their closed positions. As no overflow is now possible, the entering steam fills the injector and escapes through the compartment at to the feed water tank by way of the communication pipe (not shown).

By the employment of our invention, we enhance the efliciency of the overflow means and obviate the necessity for utilizing independent locking devices for each overflow valve.

Having now described our invention what we claim as new and desire to secure by Letters Patent is 1. In injectors, in combination, a steam nozzle, a combining nozzle, a compartmen tally divided overflow chamber, a water inlet, overflow valves upon said overflow compartments, a delivery chamber, a lever controlling one overflow valve and loaded by. the pressure in said delivery chamber, an exten sion piece attached to said lever and controlling the other overflow valve, and a looking member for said extension piece, as set forth.

2. In injectors, in combination, a steam nozzle, a combining nozzle, an overflow chamber divided into two compartments around said combining nozzle, an overflow valve upon each of said compartments, a delivery chamber, a lever engaging at one end of said overflow valves, a plunger extending into the delivery chamber and loading the other end of said lever, an extension piece pivotally attached to said lever and engaging the other overflow valve, and a screwed spindle for engaging said extension piece, as set forth.

3. In injectors, in combination, a steam nozzle, a combining nozzle, an overflow chamber divided into two compartments around said combining nozzle, an overflow valve upon each of said compartments, a delivery chamber, a lever controlling at one end of said overflow valves, a plunger extending into the delivery chamber and loading the other end of said lever, a spring resisting the movement of said lever to load the overflow. valve, an extension piece pivotally attached to said lever and controlling the other overflow valve, and a screwed spindle for acting on said extension piece, as set forth.

4. In injectors, in combination, a steam nozzle, a combining nozzle, an overflow chamber divided into two compartments around said combining nozzle, an overflow valve upon each of said compartments, a delivery chamber, a lever engaging at one end one of said overflow valves, a plunger extending into the delivery chamber and loading the other end of said lever, a swing link establishing connection between said plunger and lever, a spring resisting the movement of said lever to load the overflow valve, an extension piece pivotally attached to said lever and engaging the other overflow valve, and a screwed spindle for engaging said extension piece, as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JAMES METCALFE. RICHARD DAVID METCALFE. JAMES GROXON METOALFE. Witnesses:

HILDA Humans, JOHN CUTLER.

Copies of this patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. G. 

